Improvement in metal-turning lathes



S. JOHNSON.

METAL-TURNING LATHE.

No.185,68Z. Patented Dec. 26, 1876.

UNITED STATES PATENT OFFICE.

SANDER JOHNSON, OF MINNEAPOLIS, MINNESOTA.

IMPROVEMENT IN METAL-TURNING LATHES.

specification forming part of Letters Patent N 0. 185,68%, dated December 26, 1876; application tiled October 7, 1876.

To all whom it may concern Be it known that I, SANDER JOHNSON, of Minneapolis, in the county of Hennepin and State of Minnesota, have invented a new and Improved Attachment for Tail Stocks for Lathes, of which the following is a specification Figure 1 is a longitudinal section of a tailstock and bed of a lathe, taken on line was in Fig. 2, showing my improvement. Fig. 2 is a transverse section on line y y in Fig. 1.

Similar letters of reference indicate corresponding parts.

My improvement consists in the combination of friction-rollers placed in spring-bearings with the tail-stock of a lathe in such a manner that they bear up the tail-stock, and thus obviate friction between it and the lathebed.

The object of the invention is to provide a means whereby it is made possible to easily move the tail-stock of the heaviest lathe without the use of levers or gearing.

A is an ordinary tail-stock, and B a lathebed. a a are rollers attached to the shaft 11, and c are followers moving in sockets 9 that are attached to the inner surfaces of the sides of the tail-stock. The followersc are formed into journal-boxes at their lower ends, and rest upon the shaft 1). (J is a spring, which may be of rubber or other suitable material, that is placed between the upper end of the follower a and the end of the socket g, and is provided with a metallic plate, d. D is a setscrew that passes through the upper end of the socket g, and bears upon the spring 0. Two similar sets of friction rollers and springs are attached to the tail-stock, one set at the front, and one at the rear. These rollers run upon the lathe-bed inside of the ways. The springs in the sockets are sufficiently compressed to counterbalance the weight of the tail-stock, and nearly or quite raise it from the lathe-bed, thus relieving the friction between the stock and bed, making it an easy matter to move the heaviest tail-stock. It also obviates the necessity for oiling the ways, and thus prevents the accumulation of gum and chips, which is a common source of annoyance, and is also damaging to the latter.

Having thus described my invention, I claim as new and desire to secure by Letters Patent The combination of the rollers a, shaft 1), follower 0, spring 0, socket g, set-screw D, and the ordinary tail-stock of a iathe, substantially as shown and described.

SANDER J UHN SON. Witnesses:

C. G. GOODRIGH, J r., W. E. MOORE. 

